From £17,820
Prestige Roofing and Guttering Services is a trusted extension builder serving customers in UB11 and the surrounding area. Contact us to today to g...
From £17,860
Need to find an Extension Builder near you for all your extension buildering work?
R&P Solution LTD provides a local, trusted extension bui...
From £17,596
SS CONSTRUCTION is an established extension buildering business in UB11. We come highly recommended and provide competitive quotes for your work.<...
From £17,860
and extensions. We pride ourselves not only in quality of our work or excellence in customer service, but most importantly in the fact that we trea...
From £17,916
Trusted and professional extension builder in UB11. Experienced in all extension buildering work and keeping within budget and on quote. CC Builder...
From £17,428
G S Builders are here to help customers who need an Extension Builder in UB11. We offer a competitive rate to complete all your extension builderin...
From £17,932
GMB BUILDING SERVICES is an established and experienced local extension builder in UB11. Please contact us for a free, no obligation quote and comp...
From £17,940
La Vaastu An expert eye for design!My little practice is based in West London and I’ve been practicing for about six years. The types of archite...
From £17,748
Design Abode is a trusted extension builder serving customers in UB11 and the surrounding area. Contact us to today to get a competitive quote for ...

Underpinning ranges from £17,428 (G S Builders based in UB8) to £17,940 (La Vaastu based in ub7), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in UB11 by posting a job with HaMuch and we will send it to extension builders in UB11.
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,794

Two storey extension - £88,440

Build a timber frame extension - £26,294

Build a swimming pool - £81,294

Single storey extension - £60,872

Side return extension - £44,803

Install an RSJ - £2,494

Outbuilding - £10,294

Build a Mansard loft conversion - £52,294

Loft conversion - £36,503

Build a kitchen extension - £42,294

Hip to gable loft conversion - £42,294

Granny annexe - £87,294

Garden office - £10,294

Convert a Garage - £16,294

Garage - £18,794

Build a flat roof extension - £22,294

Build a dormer loft conversion - £42,294

Concrete foundations - £6,544

Convert a bungalow loft - £29,294

Convert a basement - £40,803